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Primes of the form k! / 10 - 1.
2

%I #11 Dec 05 2024 10:26:03

%S 11,71,503,3991679,622702079,35568742809599,

%T 30488834461171386050150399999,

%U 579712602074736798587973423157810910541235724473162595874586504971639017969389205625618453424974594047999999999999999999

%N Primes of the form k! / 10 - 1.

%H Robert Price, <a href="/A290123/b290123.txt">Table of n, a(n) for n = 1..9</a>

%H Joe McLean, <a href="http://web.archive.org/web/20091027034731/http://uk.geocities.com/nassarawa%40btinternet.com/probprim2.htm">Interesting Sources of Probable Primes</a>

%H OpenPFGW Project, <a href="http://sourceforge.net/projects/openpfgw/">Primality Tester</a>

%t Select[Table[k! / 10 - 1, {k, 5, 100}], PrimeQ[#]&]

%Y Cf. A139205, A290116, A290117, A290118, A290119, A290120, A290121, A290122.

%K nonn

%O 1,1

%A _Robert Price_, Jul 19 2017

%E Missing terms inserted by _Alois P. Heinz_, Dec 05 2024